diff --git a/packages/bindx-ui/src/datagrid/column-header.tsx b/packages/bindx-ui/src/datagrid/column-header.tsx
index bdc49fd2..3975ffa8 100644
--- a/packages/bindx-ui/src/datagrid/column-header.tsx
+++ b/packages/bindx-ui/src/datagrid/column-header.tsx
@@ -24,9 +24,10 @@ export interface DataGridColumnHeaderUIProps {
 	className?: string
 }
 
-function DataGridColumnFilterIcon({ filterName }: { filterName: string }): ReactElement | null {
+// Muted when idle so a filterable column advertises itself; blue keeps an active filter distinct.
+function DataGridColumnFilterIcon({ filterName }: { filterName: string }): ReactElement {
 	const [, , { isEmpty }] = useDataViewFilter(filterName)
-	return isEmpty ? null : <FilterIcon className="h-4 w-4 text-blue-600" />
+	return <FilterIcon className={cn('h-4 w-4', isEmpty ? 'text-muted-foreground/50' : 'text-blue-600')} />
 }
 
 export function DataGridColumnHeaderUI({
diff --git a/packages/bindx-ui/src/datagrid/ui/label-ui.tsx b/packages/bindx-ui/src/datagrid/ui/label-ui.tsx
index 14f5f1f0..ab2a0385 100644
--- a/packages/bindx-ui/src/datagrid/ui/label-ui.tsx
+++ b/packages/bindx-ui/src/datagrid/ui/label-ui.tsx
@@ -1,5 +1,7 @@
 import { uic } from '../../utils/uic.js'
 
+// Focusable so the filter affordance and its tooltip are reachable without a mouse.
 export const DataGridTooltipLabel = uic('span', {
-	baseClass: 'cursor-pointer underline decoration-dashed decoration-gray-400 underline-offset-4 hover:decoration-gray-800',
+	defaultProps: { tabIndex: 0 },
+	baseClass: 'cursor-pointer underline decoration-dashed decoration-transparent underline-offset-4 transition-colors hover:decoration-gray-400 focus-visible:decoration-gray-800 focus-visible:outline-hidden focus-visible:ring-1 focus-visible:ring-ring rounded-xs',
 })
diff --git a/packages/bindx-ui/src/ui/tooltip.tsx b/packages/bindx-ui/src/ui/tooltip.tsx
index 7e31eff3..fbad1018 100644
--- a/packages/bindx-ui/src/ui/tooltip.tsx
+++ b/packages/bindx-ui/src/ui/tooltip.tsx
@@ -27,6 +27,7 @@ export const Tooltip = forwardRef<HTMLDivElement, TooltipProps>(({
 			<div
 				className={cn(
 					'invisible opacity-0 group-hover/tooltip:visible group-hover/tooltip:opacity-100',
+					'group-focus-within/tooltip:visible group-focus-within/tooltip:opacity-100',
 					'transition-all duration-150 absolute z-50 left-1/2 -translate-x-1/2',
 					'rounded-md border border-gray-200 bg-white/90 backdrop-blur-sm shadow-md px-2 py-1.5',
 					'whitespace-nowrap',